JP2007011036A - Acoustic device of acoustic piano - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an acoustic device of an acoustic piano, which enables user to play the acoustic piano, while listening to acoustic sounds and enables the user to freely adjust acoustic effects as one likes. <P>SOLUTION: The acoustic device of the acoustic piano which emits acoustic sounds accompanying depression of keys provided on a piano body includes; a plurality of microphones which are disposed at mutually different positions of the piano body and pickup emitted acoustic sounds to convert them to musical sound signals; a signal processor which process a plurality of musical sound signals converted by the plurality of microphones; and a sound emission device which reproduces processed musical sound signals to emit musical sounds. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an acoustic apparatus for an acoustic piano that emits an acoustic sound.

  As a sound device for a conventional electronic keyboard instrument, for example, one disclosed in Patent Document 1 is known. This acoustic device is applied to a ground-type electronic piano, and includes a plurality of, for example, seven musical sound signal forming units, a sound image virtualizer, and the like. In each of the plurality of musical tone signal forming sections, musical tone waveform information corresponding to all 88 keys is stored. These pieces of waveform information are prepared in advance based on musical sounds collected at seven different points of an acoustic grand piano. Each musical tone signal forming unit reads the waveform information of the key that has been pressed in response to the key depression, generates a musical tone signal based on the waveform information, and outputs the musical tone signal to the sound image virtualizer. The sound image virtualizer splits the plurality of output musical sound signals into musical sound signals for the L and R channels, respectively, and virtualizes each channel. Then, after accumulating the plurality of virtualized tone signals, the tone signals for the L and R channels are respectively output to the corresponding speakers. Each speaker reproduces the output tone signal and emits it as a tone. As a result, in a grand-type electronic piano, an acoustic effect having a depth and spread like a musical sound emitted from an acoustic-type grand piano is obtained.

  The acoustic effect of the musical sound differs depending on the size of the space where the performance is performed (hereinafter referred to as “performance space”). For example, when the performance space becomes large like a hall, the degree of reverberation of the musical sound increases, and the acoustic effects vary depending on the performance space. However, in the conventional acoustic apparatus, the musical sound is reproduced using the waveform information prepared in advance based on the musical sound collected at different positions of the grand piano, so that it corresponds to the performance space currently being played. Only an acoustic effect is obtained. For this reason, for example, when a performance is performed in a small room, the sound spread and reverberation that are performed in a large hall are insufficient. Further, in the case of a normal grand piano or acoustic piano, since the acoustic sound is simply emitted directly, the above-mentioned problems similarly occur.

  The present invention has been made to solve such a problem, and an acoustic piano acoustic device capable of performing while listening to an acoustic sound and capable of freely adjusting an acoustic effect according to preference is provided. The purpose is to provide.

Japanese Patent Laid-Open No. 08-50479

  In order to achieve this object, the invention according to claim 1 is an acoustic apparatus for an acoustic piano that emits an acoustic sound when a key provided on the piano body is depressed, and the piano body has different positions. A plurality of microphones for picking up the emitted acoustic sound and converting it into a musical sound signal, a signal processing device for processing each of the plurality of musical sound signals converted by the plurality of microphones, and the processed musical sound signal And a sound emitting device that emits a musical sound by reproducing the sound.

  According to this acoustic piano acoustic apparatus, an acoustic sound is emitted from the piano as the key is depressed. The emitted acoustic sound is picked up by a plurality of microphones provided at different positions on the piano body and converted into musical sound signals. Each of the plurality of musical tone signals is processed by a signal processing device. Then, the musical sound signal subjected to such signal processing is reproduced by a sound emitting device and emitted as a musical sound. In this way, since the acoustic sound is directly emitted from the acoustic piano, it is possible to perform while listening to the acoustic sound as in the case of a normal acoustic piano. In addition, the acoustic sound is subjected to signal processing, and a musical sound emitted from the sound emitting device is added. Therefore, the sound effect can be freely adjusted according to preference by appropriately performing signal processing of the musical sound signal by the signal processing device.

  Furthermore, acoustic sounds are picked up from a plurality of microphones provided at different positions, and signal processing is performed for each musical sound signal. For example, a microphone is arranged at a position corresponding to the low sound range and high sound range, and each musical sound signal is different. By performing signal processing, the acoustic characteristics can be finely adjusted according to the sound range and the like.

  According to a second aspect of the present invention, in the acoustic device for an acoustic piano according to the first aspect, the sound emitting device includes a speaker.

  According to this configuration, the musical sound signal processed by the signal processing device is reproduced and emitted by the speaker of the sound emitting device. Therefore, it is possible to perform while simultaneously listening to the acoustic sound emitted directly from the acoustic piano and the musical sound emitted from the speaker.

  According to a third aspect of the present invention, in the acoustic device for an acoustic piano according to the first or second aspect, the sound emitting device includes headphones.

  According to this configuration, the signal-processed musical sound signal is reproduced and emitted by the headphones of the sound emitting device. Therefore, it is possible to perform while listening to the musical sound emitted from the headphones.

  Further, when the headphones are used, the performer becomes difficult to hear the acoustic sound from the acoustic piano, and the musical sound from the headphones directly enters the performer's ear. For this reason, when the same signal processing is performed on the musical tone signal when the sound is emitted from the headphones and when the sound is emitted from the speakers, the reverberant sound emitted from the headphones may be heard too much. For this reason, for example, when sound is emitted from a headphone, an appropriate sound corresponding to the sound emission device can be obtained by performing signal processing that suppresses the reverberant sound that is emitted, rather than when sound is emitted from a speaker. Characteristics can be obtained.

  According to a fourth aspect of the present invention, there is provided the acoustic piano acoustic device according to any one of the first to third aspects, wherein the signal processing device is an equalizer for adjusting a tone quality of a musical tone by modulating a frequency characteristic of the musical tone signal. It is characterized by including.

  According to this configuration, since the frequency characteristic of the musical sound signal is modulated by the equalizer, the sound quality of the musical sound emitted from the sound emitting device can be adjusted. Also, only by modulating the frequency characteristics, it is possible to obtain an acoustic effect corresponding to the type of piano currently being played, such as a large grand piano, a small grand piano, or an upright piano.

  According to a fifth aspect of the invention, in the acoustic piano acoustic device according to any one of the first to fourth aspects, the signal processing device includes a gain adjuster for adjusting the gain of the musical sound signal. .

  According to this configuration, the volume of the musical sound emitted from the sound emitting device can be adjusted by adjusting the gain of the musical sound signal with the gain adjuster. Thereby, the balance of the volume with the acoustic sound can be easily adjusted. Further, by adjusting the gain for each musical sound signal, the balance of the volume between the musical sounds emitted from the sound emitting device can be easily adjusted.

  The invention according to claim 6 is the acoustic piano acoustic device according to any one of claims 1 to 5, wherein the signal processing device includes a reverberation adding device for adding a reverberation effect to the musical sound signal. To do.

  According to this configuration, since the reverberation effect is added to the musical sound signal by the reverberation adding device of the signal processing device, the reverberation effect can be added to the musical sound emitted from the sound emitting device. For this reason, for example, even if the performance is performed in a small performance space, it is possible to obtain a realistic sound effect as if the performance is performed in a large performance space such as a large hall.

  The invention according to claim 7 further includes a recording device for recording a musical sound signal processed by the signal processing device in the acoustic device of the acoustic piano according to claim 6, wherein the reverberation adding device is recorded in the recording device. Reverberation effects having different depths are added to the musical sound signal and the musical sound signal emitted from the sound emitting device.

  According to this configuration, the musical sound signal subjected to signal processing by the signal processing device is emitted as a musical sound from the sound emitting device and recorded by the recording device. The reverberation adding device adds reverberation effects having different depths to the recorded tone signal and the emitted tone signal. In this way, a good reverberation effect can be achieved for any musical sound by adding a reverberation effect of a different depth to the musical sound that is currently being emitted and the musical sound that is once recorded and reproduced later. Can be added.

  According to an eighth aspect of the present invention, in the acoustic device for an acoustic piano according to the seventh aspect, the reverberation adding device adds a reverberation deeper than the musical sound signal recorded in the recording device to the musical sound signal emitted from the sound emitting device. It is characterized by adding effects.

  According to this configuration, a deeper reverberation effect is added to the emitted tone signal than the tone signal recorded in the recording device. As a result, the reverberation effect can be added to both musical sounds without excess and deficiency, and excessive reverberation effect can be prevented from being added to the recorded musical sound, while sufficient reverberation effect is added to the released musical sound. can do.

  According to a ninth aspect of the present invention, in the acoustic device for an acoustic piano according to the eighth aspect, the reverberation adding device has a predetermined amount of the musical sound signal emitted from the sound emitting device than the musical sound signal recorded in the recording device. Alternatively, a reverberation effect deep at a predetermined rate is added.

  According to this configuration, since the reverberation effect that is a predetermined amount or a predetermined rate deeper than the recorded musical sound signal is added to the emitted musical sound signal, the above-described effect of the invention according to claim 8 can be easily obtained. Can do.

  According to a tenth aspect of the present invention, in the acoustic piano acoustic device according to any one of the sixth to ninth aspects, the reverberation adding device is configured to be capable of changing the depth of the reverberation effect added to the musical sound signal. It is characterized by.

  According to this configuration, since the depth of the reverberation effect added to the musical sound signal can be changed, the degree of the reverberation of the musical sound can be finely adjusted according to preference.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. 1 and 2 show a grand piano 2 (acoustic piano) to which an acoustic device 1 according to an embodiment of the present invention is applied. In the following description, when the grand piano 2 is viewed from the performer, the front side (lower side in FIG. 2) is “front”, the rear side (upper side in FIG. 2) is “rear”, and the left side and right side Are described as “left” and “right”, respectively.

  As shown in these drawings, the piano body 3 of the grand piano 2 includes a side plate 4 that forms the outer shape of the grand piano 2, a shelf plate 6 that is horizontally fixed between the lower portions of the front portion of the side plate 4, and 4 A column assembly 7 is constructed by assembling a column 7a, a stack 7b, and the like, and a side plate 4 is attached to the outer peripheral surface of the column 7a and a string assembly (not shown) for supporting a stretched string. A soundboard 8 attached to the upper surface is provided.

  A plurality of (for example, 88) keys 9 are placed on the shelf board 6. An action (not shown) is placed on the rear end of the upper surface of the key 9, and a hammer (not shown) is provided for each key 9 on the upper side of the action.

  According to the above configuration, the action is actuated when the key 9 is pressed, whereby the hammer vibrates by striking the string, and the vibration of the string is transmitted to the soundboard 8. The acoustic sound is emitted by vibrating.

  As shown in FIGS. 3 and 4, the acoustic device 1 includes left and right channel microphones 10L and 10R, a signal processing device 11, a CD-R drive 18 (recording device), D / A converters 19L and 19R, power It comprises amplifiers 20L, 20R, speakers 21L, 21R (sound emitting device) and headphones 22 (sound emitting device), and further includes an operation panel (not shown). The speakers 21L and 21R are arranged on the left and right holding left and right plates 5L and 5R of the music stand assembly 5, for example (see FIG. 1).

  The microphones 10L and 10R are for picking up acoustic sounds emitted from the grand piano 2 and converting them into analog musical sound signals SL and SR. As shown in FIG. It is attached to the front end of the side column 7. The microphones 10L and 10R are composed of, for example, dynamic microphones, and include an electromagnetic coil and a diaphragm (both not shown) connected to the electromagnetic coil. Each diaphragm vibrates due to the acoustic sound emitted from the sound board 8, and an electromotive force proportional to the vibration is generated in the electromagnetic coil. With the above configuration, the musical sound signal SL including a large amount of the low frequency range component is output from the left channel microphone 10L, and the musical sound signal SR including the high range component is output from the right channel microphone 10R to the signal processing device 11, respectively. .

  The signal processing device 11 is for adjusting the acoustic effect by performing signal processing on the musical sound signals SL and SR. As shown in FIG. 3, the gain adjusters 12L and 12R, the low-pass filters 13L and 13R, The A / D converters 14L and 14R, equalizers 15L and 15R, and a reverberation adding device 23 are included.

  The gain adjusters 12L and 12R adjust the levels of the musical sound signals SL and SR by independently adjusting the gains of the musical sound signals SL and SR output from the microphones 10L and 10R, and then the low pass filters 13L and 13R. Respectively. The gain adjusters 12L and 12R adjust the gains of the musical sound signals SL and SR so as not to exceed the input dynamic range of the A / D converters 14L and 14R, and thereby the A / D converters 14L and 14R Prevent over-leveling. This gain setting is performed by operating the operation panel.

  The low-pass filters 13L and 13R attenuate the frequency components higher than a predetermined frequency (for example, 20 kHz) in the musical sound signals SL and SR, and pass the frequency components lower than the predetermined frequency components, and output them to the A / D converters 14L and 14R. To do. As a result, the tone signals SL and SR from which noise components have been removed are output to the A / D converters 14L and 14R.

  The A / D converters 14L and 14R convert the musical sound signals SL and SR from analog signals to digital signals, thereby generating musical sound signals SLD and SRD and output them to the equalizers 15L and 15R, respectively.

  The equalizers 15L and 15R modulate the tone signals SLD and SRD independently of each other, thereby modulating the frequency characteristics of the tone and adjusting the tone quality of the tone for each tone signal SLD and SRD. The musical sound signals SLD and SRD modulated by the equalizers 15L and 15R are branched into two systems and then output to the reverberation adding device 23. This frequency characteristic is set by operating the operation panel.

  The reverberation adding device 23 includes first sound reverb circuits 16L and 16R for sound emission and second reverb circuits 17L and 17R for recording. The two musical sound signals SLD and SLD branched from the equalizer 15L are output to the first reverb circuit 16L and the second reverb circuit 17L, respectively. Similarly, the two musical sound signals SRD and SRD branched from the equalizer 15R are output to the first reverb circuit 16R and the second reverb circuit 17R, respectively.

  Each of the first reverb circuits 16L and 16R generates a plurality of tone signals having different delay times from the tone signals SLD and SRD in accordance with a predetermined reverberation pattern, and the generated plurality of tone signals are originally generated. Is added to the musical tone signals SLD and SRD. As a result, a reverberation effect is added to the musical tone signals SLD and SRD, and then the musical tone signals SLD and SRD are output to the D / A converters 19L and 19R, respectively. The first reverb circuits 16L and 16R are configured so that the depth of the reverberation effect can be changed by changing the number of delayed tone signals and the delay time. Also, the setting of the depth of the reverberation effect is performed by operating the operation panel. Further, the first reverb circuit 16L, 16R outputs a signal indicating use of the headphone 22 when a jack (not shown) of the headphone 22 is inserted. When this signal is output, the first reverb circuit 16L , 16R are configured to add a shallower reverberation effect to the musical sound signals SLD, SRD.

  Similarly to the first reverb circuits 16L and 16R, the second reverb circuits 17L and 17R generate a plurality of tone signals having different delay times from the tone signals SLD and SRD according to a predetermined reverberation pattern. Are added to the original tone signals SLD and SRD to add a reverberation effect to the tone signals SLD and SRD, and then output to the CD-R drive 18. The second reverb circuits 17L and 17R are also configured so that the depth of the reverberation effect can be changed by changing the number of delayed tone signals and the delay time. The depth of the reverberation effect is set to be a predetermined amount or a predetermined rate shallower than the reverberation effect depth of the first reverb circuits 16L and 16R set by the operation panel.

  The CD-R drive 18 is for recording or reproducing the musical sound signals SLD and SRD. In the recording mode, the musical sound signals SLD and SRD are recorded on the CD-R 18a, and in the reproducing mode, the recorded musical sound signal is recorded. The SLD and SRD are read from the CD-R 18a and output to the D / A converters 19L and 19R.

  The D / A converters 19L and 19R respectively convert the musical sound signals SLD and SRD output from the first reverb circuits 16L and 16R or the CD-R drive 18 from digital signals to analog signals, thereby generating musical sound signals SLA and SRA. Is output to the power amplifiers 20L and 20R or the headphones 22 via a switch (not shown). The switching of the switch is performed in conjunction with the insertion / extraction of the jack of the headphone 22. The power amplifiers 20L and 20R amplify the musical tone signals SLA and SRA with a predetermined gain and output the amplified signals to the corresponding speakers 21L and 21R, respectively.

  The speakers 21L and 21R reproduce the musical sound signals SLA and SRA and emit musical sounds. The analog tone signals SLA and SRA converted by the D / A converters 19L and 19R are output to the headphone 22, and the headphone 22 reproduces them and emits the tone.

  Next, the operation of the acoustic apparatus 1 having the above configuration will be described. The operation mode of the sound device 1 is a performance mode in which a musical sound is emitted simultaneously with the acoustic sound when the grand piano 2 is played, and a reproduction mode in which the musical sound signals SLD and SRD recorded on the CD-R 18a are reproduced and emitted. The performance mode is roughly divided into a recording mode for recording the musical sound signals SLD and SRD simultaneously with the performance and a non-recording mode for not recording. These operation modes are switched by operating the operation panel.

  In the performance mode, the acoustic sound emitted along with the performance of the grand piano 2 is picked up by the microphones 10L and 10R and then converted into the musical sound signals SL and SR. Next, the tone signals SL and SR are respectively adjusted in gain by the gain adjusters 12L and 12R of the signal processing device 11, pass through the low-pass filters 13L and 13R, and are converted into digital tone signals by the A / D converters 14L and 14R. Converted to SLD and SRD. Next, the musical sound signals SLD and SRD are frequency-modulated by the equalizers 15L and 15R, respectively, and then branched into two sets. A reverberation effect is added to the set of musical sound signals SLD and SRD by the first reverberation circuits 16L and 16R for sound emission. In this case, when the reproduction is performed by the speakers 21L and 21R, a deeper reverberation effect is added than when the reproduction is performed by the headphones 22.

  Thereafter, the tone signals SLD and SRD to which the reverberation effect is added are converted into analog tone signals SLA and SRA by the D / A converters 19L and 19R, and then the speakers 21L and 21R or headphones depending on the switch switching state. By being played back at 22, the sound is emitted as a musical sound. Thereby, in addition to the acoustic sound emitted directly from the grand piano 2, it is possible to perform while simultaneously listening to the musical sounds emitted from the speakers 21L and 21R or the headphones 22.

  In addition to the above, in the recording mode, the other set of musical sound signals SLD, SRD is set by the second recording reverb circuits 17L, 17R to have a predetermined amount or a predetermined amount than the musical sound signals SLD, SRD for sound emission. After a shallow reverberation effect is added, it is recorded on the CD-R 18 a by the CD-R driver 18.

  In the playback mode, the musical sound signals SLD and SRD recorded on the CD-R 18a are reproduced by the CD-R drive 18 without playing the grand piano 2, and then converted from digital to analog musical sound signals SLA and SRA. The sound is converted and emitted as a musical sound only from the speakers 21L, 21R or the headphones 22.

  As described above, according to the present embodiment, the acoustic sound is directly emitted from the grand piano 2 in the performance mode, so that the performance can be performed while listening to the acoustic sound. The acoustic sound is subjected to signal processing by the signal processing device 11 and the musical sound emitted from the speakers 21L, 21R or the headphones 22 is added. Therefore, by appropriately performing signal processing of the musical sound signals SL and SR by the signal processing device 11, the acoustic effect can be freely adjusted according to preference. In addition, the acoustic effect can be easily adjusted by simply adding the acoustic device 1 to an existing acoustic piano.

  In addition, acoustic sounds are picked up from the microphones 10L and 10R arranged on the lowest sound side and highest sound side of the grand piano 2, and signal processing is performed for each of the musical sound signals SL and SR, so that the acoustic characteristics are finely adjusted according to the sound range. can do.

  Further, the gain adjusters 12L and 12R of the signal processing device 11 adjust the volume balance with the acoustic sound by adjusting the gains of the musical sounds independently of each other, and the sound is emitted from the speakers 21L and 21R or the headphones 22. The volume balance between musical sounds can be easily adjusted.

  Further, since the frequency characteristics of the musical sounds are modulated by the equalizers 15L and 15R, the sound quality of the musical sounds emitted from the speakers 21L and 21R or the headphones 22 can be adjusted. Also, by simply modulating the frequency characteristics of the musical sound, it is possible to obtain an acoustic effect according to the type of piano currently being played, such as a large grand piano, a small grand piano, or an upright piano.

  Furthermore, since the reverberation effect is added to the musical sound emitted from the speakers 21L and 21R or the headphones 22 by the first reverb circuits 16L and 16R, for example, even if the performance is performed in a small performance space, a large performance space such as a large hall. You can get a realistic sound effect as if you're playing. In addition, when sound is emitted from the headphones 22, appropriate acoustic characteristics corresponding to the sound emission device to be used are obtained by adding a shallow reverberation effect to the musical sound, compared to when sound is emitted from the speakers 21L and 21R. be able to.

  Further, when recording on the CD-R drive 18, a shallow reverberation effect is added as compared with the case where sound is emitted from the speakers 21L, 21R or the headphones 22. Therefore, the reverberation effect can be added to both musical sounds without excess or deficiency. it can. As a result, it is possible to prevent an excessive reverberation effect from being added to the recording musical tone, while it is possible to add a sufficient reverberation effect to the musical tone for sound emission. In addition, since the reverberation effect having a predetermined amount or a predetermined rate is added to the musical sound for sound emission, the above-described effect can be easily obtained. Further, since the depth of the reverberation effect can be changed, the degree of reverberation of the musical sound can be finely adjusted according to the preference.

  FIG. 5 shows a modified example of the reverberation adding apparatus that replaces the reverberation adding apparatus 23 of the embodiment. In this modification, the reverberation adding device 30 includes reverberation adding devices 30L and 30R for left and right channels. The reverberation adding device 30L for the left channel includes a reverb circuit 31L, two multipliers 32L and 33L, and two adders 34L and 35L. Similarly, the reverberation adding device 30R for the right channel includes , A reverb circuit 31R, two multipliers 32R and 33R, and two adders 34R and 35R. Since these reverberation adding devices 30L and 30R have the same configuration, the reverberation adding device 30L for the left channel will be described below as a representative of them.

  The reverb circuit 31L is configured in the same manner as the first reverb circuits 16L and 16R of the embodiment, and adds a predetermined reverberation effect to the musical sound signal SLD input from the equalizer 15L. The tone signal SLD to which the reverberation effect is added is output to one multiplier 32L, amplified by a predetermined gain, and then output to one adder 34L. The adder 34L adds the musical sound signal and the musical sound signal SLD output directly from the equalizer 15L without going through the reverb circuit 31L, and then adds the musical sound signal to the D / A converter 19L via a switch (not shown). Output.

  The musical tone signal SLD from the equalizer 15L is amplified with a predetermined gain by the other multiplier 33L and then output to the other adder 35L. The adder 35L adds the musical tone signal and the musical tone signal output from the reverb circuit 31L, and then outputs the resultant signal to the CD-R drive 18 and also to the D / A converter 19L via the switch.

  The switching of the switch is performed in conjunction with the insertion / extraction of the jack of the headphone 22 as in the switch of the embodiment. When this jack is inserted, the musical sound signal SLD from the adder 35L is D / A converted. After being output to the device 19L and converted into an analog musical sound signal SLA, it is played back by the headphones 22 to be emitted as a musical sound. On the other hand, when the jack of the headphone 22 is not inserted, the tone signal SLD from the adder 34L is output to the D / A converter 19L, converted into an analog tone signal SLA, and then passed through the power amplifier 20L. Sound is emitted from the speaker 21L as a musical sound.

  As described above, a deeper reverberation effect is added by adding the musical tone signal SLD output from the equalizer 15L and the amplified reverberation signal after adding the reverberation effect by one adder 34L. The musical sound signal SLD is output to the speaker 21L via the D / A converter 19L and the like.

  On the other hand, a musical sound with a shallower reverberation effect is added by adding the musical sound signal from the equalizer 15L amplified with a predetermined gain by the other adder 35L and the musical sound signal with the reverberation effect added by the reverb circuit 31L. A signal SLD is output to the CD-R drive 18.

  In the reverberation adding device 30R for the right channel, the addition by the adders 34R and 35R is performed in the same manner, so that a musical sound signal SRD with a deeper reverberation effect is output to the speaker 21R, and a musical sound with a shallower reverberation effect added. A signal SRD is output to the CD-R drive 18.

  According to the above configuration, when recording on the CD-R drive 18, a shallow reverberation effect is added compared with the case where sound is emitted from the speakers 21L and 21R. It is possible to obtain the same effect as that of the embodiment, such as addition. In addition, when sound is emitted from the headphones 22, a shallower reverberation effect is added than when sound is emitted from the speakers 21L and 21R. Therefore, as in the embodiment, appropriate acoustic characteristics according to the sound emission device to be used are obtained. Each can be obtained. Furthermore, the reverb circuit can be halved compared to the embodiment requiring four reverb circuits 16L, 16R, 17L, and 17R.

  In addition, this invention can be implemented in various aspects, without being limited to the described embodiment. For example, in the embodiment, two microphones 10L and 10R are used, but the number thereof may be arbitrarily increased. In this case, the number of gain adjusters, first and second reverb circuits, and the like are accordingly increased. You can increase it. Thereby, the acoustic effect can be finely adjusted. Furthermore, although the embodiment is an example in which the present invention is applied to a grand piano, the present invention is not limited to this, and may be applied to an upright piano. In addition, it is possible to appropriately change details within the scope of the present invention.

1 is a perspective view of a sound device according to an embodiment of the present invention and a grand piano to which the sound device is applied. It is the bottom view which abbreviate | omitted a part of grand piano of FIG. It is a figure which shows the audio equipment of FIG. It is a figure which shows the continuation of FIG. It is a figure which shows the modification of the reverberation addition apparatus of FIG. It is a figure which shows the continuation of FIG.

Explanation of symbols

1 sound device 2 grand piano (acoustic piano)
3 Piano body 9 Key 10L Microphone 10R Microphone 11 Signal processing device 12L Gain adjuster 12R Gain adjuster 15L Equalizer 15R Equalizer 18 CD-R drive (recording device)
21L Speaker (sound emitting device)
21R Speaker (sound emitting device)
22 Headphone (sound emitting device)
23 reverberation adding device 30 reverberation adding device SL music signal SR music signal

Claims (10)

An acoustic apparatus for an acoustic piano that emits an acoustic sound when a key of a key provided on the piano body is pressed,
A plurality of microphones that are provided at different positions on the piano body, pick up the emitted acoustic sound, and convert it into a musical sound signal;
A signal processing device for processing each of the plurality of musical sound signals converted by the plurality of microphones;
A sound emitting device for emitting a musical sound by reproducing the processed musical sound signal;
An acoustic apparatus for an acoustic piano, comprising:   The acoustic device according to claim 1, wherein the sound emitting device includes a speaker.   The acoustic device for an acoustic piano according to claim 1, wherein the sound emitting device includes headphones.   The acoustic apparatus for an acoustic piano according to any one of claims 1 to 3, wherein the signal processing device includes an equalizer for adjusting a tone quality of a musical tone by modulating a frequency characteristic of the musical tone signal.   The acoustic apparatus for an acoustic piano according to any one of claims 1 to 4, wherein the signal processing device includes a gain adjuster for adjusting a gain of a musical sound signal.   6. The acoustic apparatus for an acoustic piano according to claim 1, wherein the signal processing apparatus includes a reverberation adding apparatus for adding a reverberation effect to a musical sound signal. A recording device for recording the musical sound signal processed by the signal processing device;
The reverberation adding device adds reverberation effects of different depths to a musical sound signal recorded in the recording device and a musical sound signal emitted from the sound emitting device. Acoustic piano sound equipment.   8. The acoustic piano according to claim 7, wherein the reverberation adding device adds a reverberation effect deeper than a musical sound signal recorded in the recording device to a musical sound signal emitted from the sound emitting device. Sound equipment.   9. The reverberation adding device adds a reverberation effect that is a predetermined amount or a predetermined rate deeper than a musical sound signal recorded in the recording device to a musical sound signal emitted from the sound emitting device. Acoustic piano sound device as described in 1.   The acoustic device for an acoustic piano according to any one of claims 6 to 9, wherein the reverberation adding device is configured to be capable of changing a depth of a reverberation effect added to a musical sound signal.

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